For now, however, the approach to a lock involved sailing toward a wall of water like the Red Sea parted for the passage of the Israelites, fish darting hither and thither overhead like primitive birds, a surreal sight, like something out of an Escher print. Then into a lock like a water-walled grave, surrounded by these bird-fish; and then up, and up, and out onto a new level of the great straight-sided river, cutting through the black land. “Bizarre,” Maya said after the first lock, and the second and the third; and Michel could only grin and nod.

The fourth night of the trip they docked at a small canalside town called Naarsares. Across the canal was an even smaller town called Naarmalcha. Mesopotamian names, apparently. A terrace restaurant on top of the levee gave a view far up and down the canal, and behind the canal to the arid highlands flanking it. Ahead they could see where the canal cut through the wall of Gale Crater, floored with water: Gale was now a bulb in the canal, a holding area for ships and goods.

After dinner Maya stood on the terrace looking through the gap into Gale. Out of the inky talc of twilight Vendana and some companions approached her: “How do you like the canal?” they asked.

“Very interesting,” Maya said curtly. She didn’t like being asked questions, or being at the center of a group; it was too much like being an exhibit in a museum. They weren’t going to get anything out of her. She stared at them. One of the young men among them gave up, began to talk to the woman next to him. He had an extraordinarily beautiful face, features neatly chiseled under a shock of black hair; a sweet smile, an unselfconscious laugh; altogether captivating. Young, but not so young as to seem unformed. He looked Indian perhaps— such dark skin, such white regular teeth— strong, lean as a whippet, a good bit taller than Maya, but not one of these new giants— human scale still, unprepossessing but solid, graceful. Sexy.

She moved toward him slowly, as the group shifted into a more relaxed cocktail-party format, people wandering around to talk and look down at the canal and the docks. Finally she got a chance to speak with him, and he did not react as if approached by Helen of Troy or Lucy the habiline fossil. It would be lovely to kiss such a mouth. Out of the question, of course, and she didn’t even really want to. But she liked to think about it; and the thought gave her ideas. Faces were so powerful.